Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015
2015 Impairment charge		$ 22,500
Estimated amortization expense of intangible assets for 2016		22,300
Estimated amortization expense of intangible assets for 2017		19,900
Estimated amortization expense of intangible assets for 2018		19,400
Estimated amortization expense of intangible assets for 2019		18,800
Estimated amortization expense of intangible assets for 2020		18,200
Estimated amortization expense of intangible assets for later years		176,800
Series of Individually Immaterial Business Acquisitions [Member]
2015 Impairment charge		$ 1,500
Media Convergence Group (Newsy) [Member]
2015 Impairment charge	$ 21,000
Impairment of Intangible Assets (Excluding Goodwill)	$ 2,900